Gas-engine.



Nm 883,688. PATENTED APR. 7, 1908. @EN HEERY BBRH a JOHN HAYS BRGIL GASENG'JNB. ANIMATION ULM) 0012.4.1907.

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'UNITED STA-Tas PATENT OFFICE.

JOHN HENRY BIRCH AND JOHN HAYSy BIRCH, OF CRAWFORDSVILLE, INDIANA fGAS-ENGIN E.

Specification of Letters Patent.

No. 883,688. i

Patented april 7, loos.

lApplication filed October 4l, 1907. Serial No. 395,886.

To all whom 'it may concern:

Be it known that we, JOHN HENRY BIRCH and JOHN HAYs BIRCH, citizens ofthe United States, residing at Crawfordsville, in the county of`ontgomery and State of Indiana,

. have invented certaln new and useful Imshaft 14. Leading into the endheld closed by a spring 19. i outer end of the stem of valve 18 is apiston rovements in Gas-Engines, of which the ollowin is aspecification.

The o ject of our invention is to produce an exhaust `valve mechanismfor internal combustion engines of suchv character that the exhaustvalve will be intermittently voperated by the pressure within thecylinder and .will be held open b that pressure until automaticallyreleased. y a properlytimed mechanically operated valve.

The accompanying drawings illustrate our invention: Flgure 1 1s avertical section of an engine embodying ourr invention; Fig. 2 a similarsectionof the cylinder and associated parts at right angles to thesection Fig. 1; and F' 3 a plan with the ca a removed.v

l In t e drawings, 10 in icates. a power `cylinder and 11 a power pistonmounted t erein, said piston being connected by a pitvman 12 with acrank 13 carried by the crank o'f thecylinder 10 is an inlet passage 15the innorfend'of which is controlled by a puppet inlet valve 16. Leadingfrom the same end of cylinder 10 is an exhaust passage 17'c1osed by anin wardly opening exhaust valve 18 normally Secured to the 20 which fitswithin the cylindrical pistonvalve chamber 21 formed in the head 22which closes the end ofcylinder 10. Head 22 has formed in it the inletand exhaust passages and also carries the `valve 16 as well as the valve18 and said head 22 is preferably open at its outer end to facilitatethe forma tion of the water chamber .25, the cylinder 21, the bore forthe stem of valve 16, and the various otherA assages which willbe'hereinafter described? The open end of head 22 is closed by an easilremovable cap 26, the

openmgs 25 exten -ng axially through it in order to communicate with'the water space,

tends diagonally through head 22'and communicates at 4its lower end witha pipe'30 which extends downwardly through the water jacket 28, andcommunicates at its lower end with a passfge 31 which, in turn,`communicates with the chamber` 32 formed in a casting 33, secured to theside wall of cylinder 10. Formed at one side ofchamber 32 is a valveseat-34 in .which is iitted a check valve 35, normally held in itsseatby spring 35, the valve seat leading to a-passage 36 whichcommunicates with the passage 37. The passage37 passes through the wallof cylinder 10 into said cylinder at :the end of t e power stroke ofpiston 11. Leading from passage 36 is a passage 38 which communicateswith a passage v39formed through the wall` of cylinder 1() beyond thepassage .37

passage 37 is opened into the cylinder'lO.

For the purpose of mechanically `operating valve 35, we provide areciprocating in 41 which, at one end, lengages the stem o valve 35, soas to drive it in one direction against the action of spring 35 and, forconvenience and economy of construction,'` at its Aother. end carriesthe plunger 42 of `a pump 13. Pin 41- is connected by a link 44 with thestrap 45 of an eccentric 46 secured to and rotated with the crank shaft14. a v

The operation is as V follows: With the parts in the positions shown inFigs. 1 and 2, the first down stroke of piston 11 draws in a chargethrough the inlet passage 15 past valve 16, the spring of said valvebeing 'weaker .than spring 19 so that the exhaust valve does not move.On the return up stroke the charge, which has just been drawn in, willbe compressed and then ignited. The next down stroke of the piston vistherefore a power stroke, and when the end of the power stroke isreached a portionof the pressure within the cylinder will pass through`passage 37 past valve 35, said Valve opening un er the pressure, andthrou h passages 31, 30 and 29 'into the outer end o inder 21, so as toact upon the force exhaust v alve 18 inward from its seat so as to openthe exhaustv passage `17.` The the valve cylpiston 20. and

pressure in the chamber 21 is allowed to esclose theexhaust valve 18.

exhaust'valve is'thus held' open during the next return stroke of thepiston sov that the exhaust gases are driven out from the cylinder. Justas the power iston reaches the u per end of its stroke o returnfollowing ower stroke, eccentric 46 operates to mec anically open valve35, whereupon the cape ,through passages 38: and 39 i'nto the crank base40'so ,as to permitsprin 19 to It will e seen by the above that thepiston is not depended small and easi upon to close the ports to'maintain the pressure against the exhaust valve operating pistonutt'hat, insteadf the pressure against said valve-pi'stom being onceadmitted by the movement of the power-piston, is held by covering ofpassage 37 by the power piston, on this stroke, there will be nopressure, be@

yond atmospheric, in cylinder 10, and consequently there will be no.opening of valve 35 and no pressure passing into thevouter end ofchamber 21.-

We claim as our invention 4 1. In an internal combustion engine, thecombination, with a ower cylinder and istongtherein, of an exhaust valvecontrolling an exhaust passage -leading from said cylinand t e powertion der, yieldin means for normally holding said exhaust va vevclosed,a cooperating valvepiston and cylinderfor said exhaust valve, a passaebeig'fpr'ovidedbetween said cylinder cylinder to vadmit pressure to thevalve cylin' er atf the end of the power stroke of the-power-piston, avalve in said passa e arranged to retain pressures within `the v vecylinder, and a means controlled.

mentioned valve.

2.'.In an internal combustion engine, the combination, with the powercylinder and the ypower piston, of an exhaust .valveconby .thepower-plston for operating said last- V trolling an exhaust assageleadin from said cylinder, a spring or normally `c osing said valve'avalve-piston] and cylinder for actuatimg said exhaust valve inopposition to said springiwith a passage forming' a communica- .etweensaidv valve cy inder 'and the power cylinder, the said" passage beingcontrolledgat itsp'ow'er-cylinder end by the ower piston, a checjkvvalvearran ed in said ast mentioned passa e to contro eduction fromlthe valvecylin er, there being also a passage communicatin with saidchecklvalve-pwssage-beyond t e check valve relaceases i tive tothe.exhaustfvalve cylinder and controlled at its vother end by thepower-piston, and means forintermittently opening vsaid check-valve. v

3. In an internal combustion engine, the combination, with Athe powercylinder' and the power'piston, of an exhaust valve c0114 trolling 'anexhaust assage leading from said cylinder, a spring fior normall c osi i'said valve, a valve-piston'and cylin er for actuele' ing said'exhaustvalve in opposition to said sprin with a' passage formingl'a communication etweenl said valve cy `nder and the power cylinder, the saidpassage being Acontrolled at its power-cylinder end by the ower piston,a check valve arranged in said ast mentioned passage to contro eduction.

from the valve cylinder, there being also a,y passage communicating withsaid check-y valve passage beyond the check-valve rela-y tive to theexhaust-valve c linder and controlled at its other end by t epower-piston, a sprin for normally holding said checkvalve c osed, andmeans for intermittently opening said check-valve.

' 4. In an internal combustion engine, the combination, with the powercylinder and the power piston, of an exhaust valve controlllng anexhaust assage leadin from 4said cylinder, aspring` or normallyc osingsaid valve, a valyefpiston and cylinder for actuating said exhaust valvein opposition to said spring, with a passa e forming acommunicatlonbetween said va ve cylinder and the ower cylinder, the saidpassage being contro ed 'at its power-cylinder end by the ower piston, acheck'valve arran ed in said Vast mentioned passage to contro eductionfrom the valve cylinder, there being also a Ipassage communicating withsaid check-valve passage beyond the check-valve relative to the eX-Rhaustvalve cylinder and controlled at its other end by the power-piston,and amechanical connectionbetween said check valve and the power pistonfor intermittently opening said check valve.

5. In an internal combustion engine, the vlic combination, with thepower cylinder and the power piston, of an exhaust valve ccntrollin an'exhaust assage leading from said cylinder, aspring or normallyc osingsaid valve, a valve-piston and cylinder for actuat ing said exhaustvalve in opposition to said sprin with a passage formin a communicationetween said valve cy inder and the power cylinder, the said passagtctrolled at its power-cylinder end y the power piston,` a check-valvearran ed 1n said last mentioned passage to contro eduction from thevalve cylinder, there being also a passage communicatin with saidcheck-valve passage beyond t e check-valve relative to the exhaust-valvecylinder and controlled at its being con l other end by thepower-piston, a, sping for ana, 'this 28th daypf Sep'tembfer;v A1. onenormally holding said check-valve closed, thousand nine hundred andseven. f'

`and a mechanical connection between said JOHN-HENRYBIRCH. [Lisi ycheckwalve and the power iston for 'inter- JOHN HAYSJVBIRCH` [1..311 5mttently opening said chec -valve .l `Witnesses: l In Witnesswhereo, wehave hereunto set WILLIAM T. WnrrfiINGToN,

oul` hands' and seals at Crawfordsville, Indl- LOUISE MQPHEETERS. f

